Here is a list of all wildwalks take take most of the day (More then 4 hours) , they are ordered by walking time. Happy walking :)
Currie Rd Track to Ferguson St via Magazine Buildings and Davidson Park
11.2 km One way, 4 hrs 30 mins
Hard track
Little Digger Track to Davidson Reserve and Lyrebird Circuit
11.5 km One way, 4 hrs 30 mins
Hard track
Pierces Pass, Blue Gum Forest, Acacia Flats to Perrys Lookdown
10.4 km One way, 5 hrs 30 mins
Experienced only
Blackheath Station to Junction Rock Loop (via Grand Canyon and Popes Glen)
18.2 km Circuit, 8 hrs 30 mins
Hard track